Valve



NOV. 4, 1952 c, CRAWFORD 2,616,656

VALVE 2 SHEETS-SHEET 1 Filed Aug. 8, 1946 INVENTOR. CARLOS E. CRAWFORD HTTORNE/ Patented Nov. 4, 1 952 UNITED STATES PATENT OFFICE 55th I This invention; reiatgsadapted to-cpntr rtfieflow o liq md pressure and 'w hicl' iI-isf ope bl a'g h p Morespecificallygit:relat to v: plays a plurality or-smaiiiaorts which; siege and closed by felling-a belt sh'afied flexible over them. I I It is awell known tartar; atit t s x he pr s u eririiasilu valve closed but 'thathis advantage-is offset by the difficulty in opening. the valve against the pressure. Unlessthe pressure across the valve is balanced in some tter yaoperation of the valve by a float is precluded. T I have heretofore discoyeredthatby using a flexible valve to control the valve port, and peeling it away from the port inf can be opened-bymeans-of relatively hi'glrpressure. This ructurefha-s-been fully set forth-inmy Patent I f; issued; September24; 1940, Antonia of Line Delivery Valve. I I

The preSeiit-applicatiorrhfi -its object-the provision} of a different-1n ban m fojiipee g the'-valveaw'ay'from the ports? and for replacing it overjtheportst- I I I Another obj ect-isto provide'avalve mgcpa, ,spi which is capable of guiding arid-restrainingthe f at in a iv n ,patnfote peratim- I Still another object of the invention isto pro; videaj structure for Valve guiding; the. valve, for retaining" it in properrelation to "the p'oi-tsf Yet another object of the invention is to provide a valve structure which is rugged and long lived.

These and other objects will become apparent from a study of this specification and the drawings which are attached hereto and made a part hereof and in which:

Figure l is a plan view of the valve in position in a tank, showing the float and actuating lever.

Figure 2 is a side elevation viewed from the bottom of Figure 1 showing the same structure.

Figure 3 is an elevation of the valve.

Figure 4 is a sectional view of the valve taken substantially on the line 44 of Figure 2.

Figure 5 is a plan view of the valve ports.

Figure 6 is a section taken on the line 5-5 of Figure 5 showing the ports in elevation.

Referring now to Figures 1 and 2, the numeral l indicates a pressure tank which has an outlet pipe 3 fitted with a flange 5. A cover plate I is held on the flange against a gasket 9 by bolts 1 I. An opening I3 is formed in the plate and is tapped for pipe in both directions. 2 A discharge pipe (not shown) is screwed into the plate from the outside while the valve supporting pipe or port t5 "crate-a 'i'nt"; the pets on the inside. The" oft asweida-sr otherwise fixed'to 3 mats lTwhich is preferably inclined to pipe, The psrsp ate is stepped, assuojwn l9' in Figures-2,- 5 and 6, and has a twenty-trades 2-! =forined in the lower or thinn'i em; 20. I pisramy er; pert-pimps 23 foifmedas shOulstreet-"ppiesarerrmmnm 7 or o'therwise' held in f I l andth 'ln th above the shoulder 6f each-nipple is 11 2 that me 6613, is flush with gle surface of tl'i -"tliikehportibn 25 of the port are";

Stops 21 are fined to the upper and leper-esca e thepbrt plae to limit the valve travel; -Gilide fails 31 iripiii'lted between the ssep ea acli sideof the-plat'ari'd-have'invvardly arrested it, ape the axis 6' th tibh-n meters by the plates. II

1tfiirf-AE passes laterally throughthe central portion of the block and through the plates while pins 41 set in plates 39 project under flange 33 of the rails 3|.

A pivot pin 49 is fixed in the pipe l5 and is engaged at either end by the arms 5| of a yoke 53. These arms are provided with slots 55 intermediate their ends and these receive the ends of rod 45 of the valve carriage. The upper or free ends of the arms are bent inwardly and fixed to a float 51 in any suitable manner. Suitable cotter pins or other fastenings hold the yoke in place on the pivot pins. Suitable spacers 59 and 6! are provided on the pins to hold the valve centralized with respect to the port plate.

It is obvious, of course, that instead of being float operated the valve may be operated by a solenoid, a lever, a hand wheel, a diaphragm or any other suitable means.

Operation Assuming that the parts are in the position indicated by full lines in Figure 2, it will be apparent that the belt 43 is disposed in sealing re- 3 lation over all of the ports, and since the pressure is in the tank, the valve (belt) is pressed down on the nipples. As liquid enters the chamber the float rises and through the yoke, which pivots on pin 49, transmits movement to the car- Ila e.

P ins 41, flanges 33 and slots 55 in arms 5| prevent the carriage from lifting from its seat and it will consequently be moved upwardly in a path parallel to the port plat I1. The valve will be rolled back at the trailing end of the carriage so that the port shown on the extreme right will first open. This is a relatively small port and can be readily opened; and when it is opened, the pressure difierential across the valve will be reduced.

As the float rises additional ports are opened, one at a time, and the differential becomes less and less. The ports are therefore made progressively larger from right to left of Figure 5.

As the liquid level falls, the float drops and the carriage will roll downwardly to the right (Fig. 1) and progressively close the ports.

It is obvious that various changes may be made in the form, structure and arrangement of parts without departing from the spirit of the invention. Accordingly, applicant does not desire to be limited to the specific embodiment disclosed herein primarily for purposes of illustration; but instead, he desires protection falling fairly within the scope of the appended claims.

What I claim to be new and desire to protect by Letters Patent of the United States is:

1. In a fluid control valve, the combination of a valve seat, outlet port meansdeflned by said seat, a valve formed as an endless belt, said seat and valve being disposed so that the fluid being controlled will be applied to the valve in a direction to hold the valve against the seat, a carriage comprising a block, rolls mounted on opposite ends thereof for receiving said belt and means connected to the carriage for actuating said carriage to roll said valve on said seat to open and close said port means.

2. In a fluid control valve, the combination of a valve seat, outlet port means defined by said seat, a valve formed as an endless belt, said seat and valve being disposed so that the fluid being controlled will be applied to the valve in a direction to hold the valve against the seat, a carriage comprising a block, rolls mounted on op posite ends thereof for receiving said belt, means 4 on said block for holding said belt on the rolls, and means connected to the carriage for actuating said carriage to roll said valve on said seat to open and close said port means.

3. In a fluid control valve, the combination of a valve seat, outlet port means defined by said seat, a valve formed as an endless belt, said seat and valve being disposed so that the fluid being 'controlled-will'ba applied tothe valve 'a direction to hold the valve against the seat, a carriage adapted to support said belt and means comprising a pivotally mounted lever pivotally connected with said carriage for actuating said carriage to roll said valve on said seat to open and close said port means.

4. In a fluid-control valve, the combination of a valve seat, outlet port means defined by said seat, a valve formed as an endless belt, said seat and valve being disposed so that the fluid being controlled will be applied to the valve in a direction to hold the valve against the seat, a carriage adapted to support said belt, means comprising a fixed rail on each side of the carriage and rail contacting means on both sides of said carriage, at each end thereof, for holding said valve on said seat and means connected to the carriage for actuating said carriage to roll said valve on said seat to open and close said port means.

CARLOS EVERE'I'IE CRAWFORD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

